grafana: minor fixes

roles/grafana/tasks/main.yml

@@ -8,18 +8,17 @@
   until: apt_result is succeeded
 
 - name: Import Grafana GPG signing key
-  apt_key:
-    url: https://packages.grafana.com/gpg.key
-    state: present
-  register: apt_key_result
-  retries: 3
-  until: apt_key_result is succeeded
+  get_url:
+    url: https://apt.grafana.com/gpg.key
+    dest: /usr/share/keyrings/grafana-release-keyring.gpg
 
 - name: Add Grafana repository
-  apt_repository:
-    repo: deb https://packages.grafana.com/oss/deb stable main
-    state: present
-    update_cache: true
+  deb822_repository:
+    name: collabora
+    types: deb
+    uris: https://apt.grafana.com
+    suites: stable
+    signed_by: /usr/share/keyrings/grafana-release-keyring.gpg
 
 - name: Install Grafana
   apt: